Question

EX04-2 Tensile tests on aluminum alloy rods are conducted at three different times, which results in three different average values in megapascals (MPa). On the first occasion, 5 tests are conducted with an average of 207 MPa (30,000 psi); on the second occasion, 6 tests, with an average of 203 MPa; and on the last occasion, 3 tests, with an average of 206 MPa. Determine the weighted average.

          EX04-2
Tensile tests on aluminum alloy rods are conducted at three different times, which results in three different average values in megapascals (MPa). On the first occasion, 5 tests are conducted with an average of 207 MPa (30,000 psi); on the second occasion, 6 tests, with an average of 203 MPa; and on the last occasion, 3 tests, with an average of 206 MPa. Determine the weighted average.

EX04-2
Tensile tests on aluminum alloy rods are conducted at three different times, which results in three different average values in megapascals (MPa). On the first occasion, 5 tests are conducted with an average of 207 MPa (30,000 psi); on the second occasion, 6 tests, with an average of 203 MPa; and on the last occasion, 3 tests, with an average of 206 MPa. Determine the weighted average.

Added by David H.

Elementary Statistics a Step by Step Approach

Allan G. Bluman 9th Edition

Instant Answer

Solved by Expert Christopher Dzorkpata

05/17/2024

Step 1

Step 1: The weighted average is calculated by multiplying each average value by the number of tests conducted for that average, summing the results, and then dividing by the total number of tests. Show more…

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EX04-2 Tensile tests on aluminum alloy rods are conducted at three different times, which results in three different average values in megapascals (MPa). On the first occasion, 5 tests are conducted with an average of 207 MPa (30,000 psi); on the second occasion, 6 tests, with an average of 203 MPa; and on the last occasion, 3 tests, with an average of 206 MPa. Determine the weighted average.